The potential of the housefly to carry different pathogenic bacteria has been studied extensively. Fukushima et al. (1979) isolated Yersinia enterocolitica from
flies collected from a piggery. Rose and Kapperud (1983) isolated Campylobacter jejuni from houseflies captured from a chicken farm and a piggery. Recently,
Olsen and Hammack (2000) isolated Salmonella spp., among them S. enteritidis, from different types of flies collected at caged-layer chicken facilities that had produced eggs implicated in two recent outbreaks of S. enteritidis.